Improvement in the manufacture of mattocks



UNITED STATES PATENT' OFFICE JOHN C. KLEIN, OF PITTSBURG, PENNSYLVANIA.

IMPRCVEMENT IN THE MANUFATURE OF MATTOCKS.

Specification forming part of Leiters Patent No. 146,596, dated January 20, 1874; application filed August 5, 1873.

To all whom it may concern:

Be it known that I, JOHN CHRISTIAN KLEIN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in the Art of Manufacturing Mattocks, of which the following is a specification: A v

In the manufacture of mattocks it is desirable that the eye should be of sufficient length to enable it to be securely attached to the helve, and provided with a ridge extending along the center of the blade Vto the top of the eye, and also that the blade should be of suf Iiclilen't width to serve the ordinary purposes of a oe.

Heretofore the blanks have been worked into shape entirely by hammering or swaging, and attempts have been made to form the blank between dies in a press or between rolls, to give to it an approximate form previously to its being finished under the hammer.

My invention consists in rst punching the eyein the usual way, then placing the blank between dies that will form the enlargement i for the eye, and crease the blade end of the blank in such manner that it may be subsequently flattened out to the required width, and then passed between or formed by other dies to finish the eyein a simple and effectual manner.

In the accompanying drawings, Figure l is a perspective view of a rectangular block or bar of iron of suitable dimensions to form the body of the mattock by the method hereinafter described; Fig. 2, a similar view of the blank, after the eye has been punched edge Wise through it Fig. 3, a similar view of the I blank, looking upon one side thereof after the eye has been struck up, and the crease formed and 8 are perspective views of theupper and lower dies. Fig. 9 is a side elevation of the same. Fig. 10 is a crosssection on the line :v

of Fig. 9.

'In order that the method herein described may be fully understood, I will describe its various steps from the beginning to the end of the operation.

Irst takea rectangular block of iron (as shown in Fig. 1,) and heat it to the required I distance, and leaves the projecting part of the` eye solid. As it is desirable to form a high eye, the blank is much higher but not so wide as that ordinarily used, and consequently it will be more difficult to flatten the hoe end sufficiently by the means heretofore used, and furthermore to leave a high ridge through the center of the blade of the mattock that shall extend to the top 'of the eye.

In order that these obj ects may be thoroughly accomplished, one of the dies is formed with a Vshaped concavity at its blade'end, and the other die has a V-shaped ridge that is arranged directly above the corresponding concavity, so that the metal will be creased or bent along the center of the blade end to form a crease or corrugation, and also a high ridge extending to the top ofthe eye. The blank when thus formed is next reheated and placed between other dies that iiatten out the corrugation to complete the blade, as shown in Fig. 5, without mutilating or destroying the ridge. The mandrel is then driven into the eye to ena large it, and also serves tohold and manipulate it, (as shown in Fig. 6,) while the projection for the eye is partly drawn out and rounded,

`and the outer surface of the eye is finished by swaging or rolling between suitable dies, as fully described in the application filed simul taneously with this. The bladeof the hoe is then plated, and the ax finished under the hammer in the usual Way.

The present method of hammering or swaging out the blade is aslow and tedious operai tion, and requires great skill to form the blade into the required shape, and the dies and l methods heretofore used for partly perform ing the operation between rolls or other mev ehanieal devices have been defect-ive, inasmuch as the metal Will be rolled or pressed to a greater extent longitudinally than it Will laterally, and the blade thus formed will not be of the required Width.

By my improved method of first bending the metal longitudinally, and then rolling or stamping it, I am enabled to form a verybroad blade in a simple and effectual manner, and,

furthermore, form a high solid eye, and leave a sharp and Well-deiined ridge along the center of the blade that Will extend to the top edge oi' the eye, and materially strengthen the blade and eye of the mattock at these parts.

` JOHN CHR. KLEIN.

vllitnesses E. C. DAvIDsoN, Jos. I. PEYToN. 

